Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
ve triet » va trien, su triet
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
vi ve » va ve, gi ve, ve ve

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky lang) OR (ky nang)) hoa hoc. hieu va nam thuc vat hanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky nang)) hoa hoc. hieu va nam thuc vat hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky nang)) hoa hoc. hieu va nam thuc vat hanh vi ve triet*.